Texas Instruments TPA0172EVM - (Rev. A) User guide
- Category
- Car audio amplifiers
- Type
- User guide
February 2001 Mixed-Signal Products
User’s Guide
SLOU103A
IMPORTANT NOTICE
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TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, Texas Instruments Incorporated
iii
Read This First
How to Use This Manual
This document contains the following chapters:
Chapter 1—Introduction
Chapter 2—Operation
Related Documentation From Texas Instruments
TI Plug-N-Play Audio Amplifier Evaluation Platform
(literature
number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.
TPA0172 2-W Stereo Audio Power Amplifier With I
2
C Bus
(literature number SLOS327) This is the data sheet for the
TPA0172 audio amplifier integrated circuit.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
Running Title—Attribute Reference
iv
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
Running Title—Attribute Reference
v
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Feature Highlights 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA0172 EVM Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Operation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Stand-Alone Connection Diagram 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Reference 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.1 EVM Schematic 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.2 EVM Parts List 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.3 I
2
C Interface Information 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.4 Module PCB Layers 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1 The TI TPA0172 Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Stand-Alone Module Map 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 TPA0172 EVM Connected for Stereo BTL Output 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 TPA0172 EVM Schematic Diagram 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–6 TPA0172 EVM PCB 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–7 TPA0172 EVM Silkscreen 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–8 TPA0172 EVM Bottom Layer 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Platform Jumper and Switch Settings for the TPA0172 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Typical TPA0172 EVM Jumper Settings 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 TPA0172 EVM Gain Control 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 Typical TPA0172 EVM Jumper Settings 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 TPA0172 EVM Gain Control 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–6 TPA0172 EVM Parts List 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–7 TPA0172 I
2
C Register Definitions 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–8 TPA0172 Gain Settings Truth Table 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–9 TPA0172 Control Register Operation 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi
1-1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA0172
audio amplifier evaluation module (SLOP211). It includes a list of EVM
features, a brief description of the module illustrated with a pictorial diagram,
and a list of EVM specifications.
Topic Page
1.1 Feature Highlights 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA0172 EVM Specifications 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1
Feature Highlights
1-2
Introduction
1.1 Feature Highlights
The TI TPA0172 audio amplifier evaluation module and the TI plug-n-play
audio amplifier evaluation platform include the following features:
TPA0172 Stereo 2-W Audio Power Amplifier Evaluation Module
I
2
C Bus compatible
Internal depop circuitry to minimize transients in outputs
Powers up at mute volume level to avoid pop
Dual channel, bridge-tied load (BTL) or single-ended operation
2 W per channel output power into 4 Ω at 5 V, BTL
Low current consumption in shutdown mode (15 µA)
Internal input MUX selects among two sets of stereo inputs
Digital volume control from +20 dB to –60 dB
Microprocessor mode volume control
Differential stereo inputs
PC beep input
Quick and Easy Configuration with The TI Plug-N-Play Audio Amplifier
Evaluation Platform
Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections
Platform provides flexible power options
Jumpers on the platform select power and module control options
Switches on the platform route signals
Platform provides quick and easy audio input and output connections
Platform Power Options
External 5-V – 15-V DC V
CC
supply inputs
External regulated V
DD
supply input
Socket for onboard 5 V/3.3 V V
DD
voltage regulator EVM
On-board overvoltage and reverse polarity power protection
Platform Audio Input and Output Connections
Left and right RCA phono jack inputs
Miniature stereo phone jack input
Left and right RCA phono jack outputs
Left and right compression speaker terminal outputs
Miniature stereo headphone jack output
Description
1-3
Introduction
1.2 Description
The TPA0172 Stereo 2-W audio Ppower amplifier evaluation module is a
complete, 2-Watt per channel stereo audio power amplifier. It consists of the
TI TPA0172 Stereo 2-W audio power amplifier IC along with a small number
of other parts and a D–25 connector mounted on a circuit board that measures
approximately 2 1/4 inches by 2 inches (Figure 1–1).
Figure 1–1.The TI TPA0172 Audio Amplifier Evaluation Module
GND
ROUT+
ROUT–
SE/BTL
S1
SHUTDOWN
GND
LOUT–
LOUT+
C11
C9
VDD GND
L IN+
GND
L LINE–
L HP
VDD
GND
R HP
R LINE–
GND
R IN+
C12
+
TPA0172 EVM Board
SLOP211
Rev. A
+
1999
TEXAS
INSTRUMENTS
R4
R3
TP1
C1
P1
R5
Q1
S3
R1
C3
C5
C4
TP2
U1
C2
C7
C6
C8
S4
R2
C10
S2
TP5
R6
R8
TP3
Q2
TP6
R7
R9
TP4
Single in-line header pins extend from the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluation platform, or to be wired directly into existing circuits and equipment
when used stand-alone.
The platform has room for a single TPA0172 evaluation module and is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
and connects them to a versatile array of standard audio input and output jacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to
hook up
.
TPA0172 EVM Specifications
1-4
Introduction
1.3 TPA0172 EVM Specifications
Supply voltage range, V
DD
4.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, I
DD
2 A max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power per channel, P
O
: 4-Ω BTL, V
DD
=5 V 2 W. . . . . . . . . . . . . . . . . . . . . . . .
Audio input voltage, V
I,
: HP input 5 Vpp max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line input 5 Vpp max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PC Beep input 5 Vpp max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, R
L
3 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
Operation
Quick start lists in this chapter contain steps that can be followed to quickly
prepare the TI plug-n-play audio amplifier evaluation platform for use with the
TPA0172 audio amplifier EVM, or to connect the TPA0172 audio amplifier
EVM for stand-alone operation.
Using the TPA0172 audio amplifier evaluation module with the TI evaluation
platform is a quick and easy way to connect power, signal and control inputs,
and signal outputs to the EVM, using standard connectors.
The TPA0172 audio amplifier evaluation module can also be used stand-alone
by making connections directly to the module pins, and it can be wired directly
into existing circuits or equipment. A stand-alone connection diagram appears
below.
A schematic, parts list, I
2
C interface information, and PCB and layer
illustrations for the EVM are included in the Reference section of this chapter.
Topic Page
2.1 Precautions 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Stand-Alone Connection Diagram 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Reference 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2
Precautions
2-2
Operation
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to V
CC
power input connector J1, J2, and/or V
DD
power
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied—damage
to the EVM board, the platform, or both may result.
Figure 2–1.Quick Start Platform Map
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
ICC
JP4
F1
VR1
R1
JP3
JP2
JP1
AC/DC
(J2)
VCC(J1)
D1
D2
D3
D4 J2
J3
J4
J5
AC/DC
In
VCC
In
+
J1
DC
SOURCE
LED1
VCC
LED2
VDD
R2
JP5
IDD
B1
U6
POWER
SUPPLY
U3 U4
U5
U1
U2
Audio
Power
Amps
OnOff
Conditioning
S2
J7
J8
Right
Out
Left
Out
+– +–
JP6
Mode
Mute
Spk(U2-U4)
JP8
J9
Left
Out
JP7
S3
HP
Source
U2-U4
U5
Polarity
Lo
Hi
HP(U5)
C3 C2
+
+
R3
R5
J10
Stereo
HP Out
TP1
GND
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
Stereo
In
Right
In
Left
In
J6
In/Out
VDD
F2
VR2
+
DC
Power
In/Out
Speaker
Output
Headphone
Output
Audio
Input
Power
Input
Batt
C1+
Right
Out
On
Off Pwr
S1
TEXAS
INSTRUMENTS
1997
R4
7a
1
23
4
7b
7b
7b 7b
9
10
14
6 5
Quick Start List for Platform
2-3
Operation
2.2 Quick Start List for Platform
Follow these steps when using the TPA0172 EVM with the TI plug-n-play audio
amplifier evaluation platform (see the platform user’s guide, SLOU011, for
additional details). Typical platform switch and jumper settings are shown in
Table 2–1 and typical EVM settings are shown in Table 2–2. Numbered
callouts for selected steps are shown in Figure 2–1 and Figure 2–2.
Platform preparations
Table 2–1. Platform Jumper and Switch Settings for the TPA0172
EVM JP6 JP7 JP8 S2 S3
P-N-P Platform Mode X Hi Note 2 U2–U4
Notes: 1) X = Don’t care
2) Set S2 to
ON
when signal conditioning board is installed in U1; set S2
to
OFF
when no signal conditioning board is installed.
1) Ensure that all external power sources are set to
OFF
and that the platform
power switch S1 is set to
OFF.
2) Install a TPA0172 module in platform socket U2, taking care to align the
module pins correctly.
3) Use switch S2 to select or bypass the signal conditioning EVM (U1).
4) Set control signal Polarity jumper JP8 to Hi
.
5) Set jumper JP6 to select the
Mode
control input (causes the TPA0172 to
switch to the single-ended output mode if a plug is inserted into platform
headphone jack J10).
6) If the headphone Jack (J10) output will be used, set headphone source
switch S3 to U2–U4.
Power supply
7) Select and connect the power supply (ensure power supply is set to
OFF
):
a) Connect an external regulated power supply set to 5 V to platform V
DD
power input connector J6 taking care to observe marked polarity,
or
b) Install a voltage regulator EVM (SLVP097 or equiv.) in platform socket
U6. Connect a 7 V – 12 V power source to a platform V
CC
power input
J1 or J2 and jumper the appropriate power input (see platform user’s
guide).
Inputs and outputs
8) Ensure that the audio signal source level is set to minimum.
9) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
10) Connect speakers to left and right RCA jacks J7 and J9 or to stripped wire
speaker connectors J8.
Quick Start List for Platform
2-4
Operation
Evaluation Module Preparations
Figure 2–2.Module Map
GND
ROUT+
ROUT–
SE/BTL
S1
SHUTDOWN
GND
LOUT–
LOUT+
C11
C9
VDD GND
L IN+
GND
L LINE–
L HP
VDD
GND
R HP
R LINE–
GND
R IN+
C12
+
TPA0172 EVM Board
SLOP211
Rev. A
+
1999
TEXAS
INSTRUMENTS
R4
R3
TP1
C1
P1
R5
Q1
S3
R1
C3
C5
C4
TP2
U1
C2
C7
C6
C8
S4
R2
C10
S2
TP5
R6
R8
TP3
Q2
TP6
R7
R9
TP4
12
11
11) Jumpers S2 and S3 select the least significant bits of the EVM I
2
C
address.
See section 2.5.3 for details
.
12) To allow the module SE/BTL control input to switch the amplifier IC
between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper S4 to
OFF
. To keep the module amplifier IC in the
single-ended output mode regardless of the control input state, set jumper
S4 to
ON
.
Table 2–2. Typical TPA0172 EVM Jumper Settings
EVM S2 S3 S4
TPA0172 OFF ON ON
Note: ON = Shunt installed, OFF = Open
13) When the module powers up or comes out of shutdown, the gain is set at
the –85 dB level. Gain settings can be adjusted through an I
2
C interface,
connecting to the EVM via connector P1 or through test point terminals
TP3, TP4, TP5, and TP6 (Table 2–3).
See section 2.5.3 for details.
Table 2–3. TPA0172 EVM Gain Control
CONNECTOR P1 TEST POINT TERMINAL FUNCTION
Pin 1 TP6 SDA input
Pin 10 TP3 SCL output
Pin 14 TP5 SCL input
Pin 15 TP4 SDA output
Power Up
14) Verify correct voltage and input polarity and set the external power supply
to
ON
. If V
CC
and an on-board regulator EVM are used to provide V
DD
, set
platform power switch S1 to
ON
.
Platform LED2 should light indicating the presence of V
DD
, and the evaluation
modules installed on the platform should begin operation.
15) Adjust the signal source level as needed.
Quick Start List for Stand-Alone
2-5
Operation
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA0172 EVM stand-alone or when connecting
it into existing circuits or equipment. Connections to the TPA0172 module
header pins can be made via individual sockets, wire-wrapping, or soldering
to the pins, either on the top or the bottom of the module circuit board. Typical
EVM jumper settings are shown in Table 2–4. Numbered callouts for selected
steps are shown in Figure 2–3.
Figure 2–3.Stand-Alone Module Map
GND
ROUT+
ROUT–
SE/BTL
S1
SHUTDOWN
GND
LOUT–
LOUT+
C11
C9
VDD GND
L IN+
GND
L LINE–
L HP
VDD
GND
R HP
R LINE–
GND
R IN+
C12
+
TPA0172 EVM Board
SLOP211
Rev. A
+
1999
TEXAS
INSTRUMENTS
R4
R3
TP1
C1
P1
R5
Q1
S3
R1
C3
C5
C4
TP2
U1
C2
C7
C6
C8
S4
R2
C10
S2
TP5
R6
R8
TP3
Q2
TP6
R7
R9
TP4
7
6
Power supply
1) Ensure that all external power sources are set to
OFF.
2) Connect an external regulated power supply set to 5 V to the module VDD
and GND pins taking care to observe marked polarity.
Inputs and outputs
3) Ensure that audio signal source level adjustments are set to minimum.
4) Connect the right (left) positive lead of the audio source to the module
R LINE– (L LINE–) pins and the negative lead to the R IN+ (L IN+) pins.
If using the headphone inputs, connect the positive audio source to the
module R HP (L HP) and the negative lead to R IN+ (L IN+). The inputs
can be used with a differential or single-ended audio source, but the
headphone and line have common positive inputs.
5) Select output mode:
a) For BTL output, connect a speaker to the module OUT+ and OUT–
pins of each channel,
or
b) For single-ended output, connect a headphone or a speaker to the
module OUT+ and GND pins of each channel through a 33 µF to
1000 µF output-coupling capacitor (Figure 3–10).
Quick Start List for Stand-Alone
2-6
Operation
Evaluation Module Preparations
6) Jumpers S2 and S3 select the least significant bits of the EVM I
2
C
address.
See section 2.5.3 for details
.
7) To allow the module SE/BTL control input to switch the amplifier IC
between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper S4 to
OFF
. To keep the module amplifier IC in the
single-ended output mode regardless of the control input state, set jumper
S4 to
ON
.
Table 2–4. Typical TPA0172 EVM Jumper Settings
EVM S2 S3 S4
TPA0172 OFF ON ON
Note: ON = Shunt installed, OFF = Open
8) When the module powers up or comes out of shutdown, the gain is set at
the –85 dB level. Gain settings can be adjusted through an I
2
C interface,
connecting to the EVM via connector P1 or through test
point terminals
TP3, TP4, TP5, and TP6 (Table 2–5). To ensure a common ground path,
connect a ground wire between a ground point on the I
2
C transmitting
device and GND on the EVM.
See section 2.5.3 for details.
Table 2–5. TPA0172 EVM Gain Control
CONNECTOR P1 TEST POINT TERMINAL FUNCTION
Pin 1 TP6 SDA input
Pin 10 TP3 SCL output
Pin 14 TP5 SCL input
Pin 15 TP4 SDA output
Control Inputs
9) Connect control lines to the various module control input pins as needed:
a) SE/BTL
: A high selects the single-ended (SE) output mode; a low or
float selects the bridge-tied load (BTL) output mode.
b) SHUTDOWN: A low shuts down the amplifier IC on the module; a high
or float allows normal operation.
Power-up
10) Verify correct voltage and input polarity and set the external power supply
to
ON.
The EVM should begin operation.
11) Adjust the signal source level as needed.
Stand-Alone Connection Diagram
2-7
Operation
2.4 Stand-Alone Connection Diagram
The power supply range is 4.5 V to 5.5 V and isolated RO/MO+ and LO/MO–
lines for BTL operation are required.
Note that the source of any shutdown signal applied to the EVM SHUTDOWN
pin must be able to sink the current flowing through the pullup resistor on the
module (100 kΩ) when the pin is held low.
Figure 2–4 shows a TPA0172 EVM connected for stereo BTL operation.
Figure 2–4.TPA0172 EVM Connected for Stereo BTL Output
Right
Left
5 VDC
Audio
Input
(Left)
Audio
Input
(Right)
GND
ROUT+
ROUT–
SE/BTL
S1
SHUTDOWN
GND
LOUT–
LOUT+
C11
C9
VDD GND
L IN+
GND
L LINE–
L HP
VDD
GND
R HP
R LINE–
GND
R IN+
C12
+
TPA0172 EVM Board
SLOP211
Rev. A
+
1999
TEXAS
INSTRUMENTS
R4
R3
TP1
C1
P1
R5
Q1
S3
R1
C3
C5
C4
TP2
U1
C2
C7
C6
C8
S4
R2
C10
S2
TP5
R6
R8
TP3
Q2
TP6
R7
R9
TP4
Reference
2-8
Operation
2.5 Reference
This section includes the TPA0172 EVM schematic, the EVM parts list, a
discussion of the I
2
C interface, and the module PCB layers.
2.5.1 EVM Schematic
Figure 2–5 shows the TPA0172 EVM schematic.
Figure 2–5.TPA0172 EVM Schematic Diagram
LOUT–GND
SCLLOUT+
PV
DD
BYPASS
I
2
CV
DD
RLINEIN
ADDRESS1
SDA
RIN
SE/BTL
SHUTDOWN
LIN
LHPIN
V
DD
LLINEIN
PCBEEP
10
9
12
11
6
5
8
7
2
1
4
3
19
18
17
16
15
14
13
20
LHP
ROUT–
TPA0172
LIN+
RIN+
C6 0.47 µF
C8 0.47 µF
ROUT+
ROUT–
GND
23
22
21
24
C7 0.47 µF
C2 0.47 µF
C10 0.47 µF
C3 0.47 µF
RHP
RLINE–
PCBEEP
TP2
LLINE–
SHUT
DOWN
V
DD
C9 10 µF
C5
0.1 µF
V
DD
LOUT–
LOUT+
SHUTDOWN
ROUT+
GND
RHPIN
ADDRESS0
PV
DD
R2 100 kΩ
ADDRESS0
S2
V
DD
C4 0.1 µF
C1 0.47 µF
R3 100 kΩ
S3
ADDRESS1
SE/BTL
S4
SE/BTL
R5 100 kΩ
C11
0.47 µF
TP1
CONNECTOR
P1
R4
0 Ω
R1
100 kΩ
S1
18
19
20
21
22
23
24
25
10
14
1
15
TP3
R8
1.82
kΩ
R6
100 kΩ
2N2222
Q1
TP5
R7
100 kΩ
TP6
2N2222
R9
1.82
kΩ
Q2
TP4
+
C12
10 µF
+
V
DD
†
V
DD
V
DD
V
DD
†
I
2
CV
DD
is connected to V
DD
via a blue wire on the evaluation module. To use a different voltage for the I
2
C interface, the wire
must be disconnected and the I
2
C power supply connected to TP1.
†
Reference
2-9
Operation
2.5.2 EVM Parts List
Table 2–6 is the TPA0172 EVM parts list.
Table 2–6.TPA0172 EVM Parts List
Ref. Description Size
EVM
Qty.
Manufacturer/
Part Number
Vendor Number
C4, C5 Capacitor, 0.1 µF @ 25 V,
10%, nonpolarized
0805 2 Murata
GRM40-X7R104K25
Arrow
GRM40-X7R104K25
C1 – C3,
C6 – C8,
C10, C11
Capacitor, 0.47 µF @ 16 V
+80%/–20%, nonpolarized
0805 8 Murata
GRM40-Y5V474Z16
Arrow
GRM40-Y5V474Z16
C9, C12 Capacitor, 10 µF @ 6.3 V A 2 Panasonic
ECS–TOJY106R
Digi-Key
PCS1106CT–ND
R1 – R3,
R5 – R7
Resistor, 100 kΩ, 1/10 W,
5%
0805 6 Panasonic
ERJ-6GEYJ104V
Digi-Key
P100KACT-ND
R8, R9 Resistor, 1.82 kΩ, 1/10 W,
1%
0805 2 Panasonic
ERJ-6ENF1821V
Digi-Key
P1.82KCTR-ND
R4 Resistor, 0 Ω, 1/10 W, 5% 0805 1 Phycomp
9C08052A0R00JLHFT
Digi–Key
311–0.0ATR–ND
S1 Switch, momentary SMD 1 Panasonic
P8050SCT–ND
Digi-Key
P8050SCT-ND
TP1 –
TP6
Test points, red 6 Farnell
240–345
S2 – S4 Headers, 2 position 2 mm 3 Norcomp Digi-Key
2163S–02–ND
P1 D-SUB connector, 25-pin,
male, PCB mount
1 Norcomp
172–025–111–001
Digi-Key
525M–ND
Q1, Q2 Transistor, 2N2222 SOT–23 2 Rohm
SST2222AT
Mouser
592–SST2222A
U1 IC, TPA0172 2-W,
2–channel audio amplifier
TSSOP-24 1 TI
TPA0172PWP
Reference
2-10
Operation
2.5.3 I
2
C Interface Information
The 8-bit I
2
C address of the TPA0172 is 11011a1a0(r/w). Bits 2 and 1,
designated as a1 and a0, are set by the ADDRESS1 and ADDRESS0 pins,
respectively. Bit 0, designated as (r/w), is the read/write bit where a 0
designates the write operation and a 1 designates the read operation.
The TPA0172 has six 8-bit registers with power-up/reset values and bit
assignments as shown in Table 2–7.
Table 2–7. TPA0172 I
2
C Register Definitions
REGISTER NAME POWER-UP/RESET VALUE
(b7b6b5...b0)
BIT ASSIGNMENT
Ri ht i i t 1
0–5: Gain level
Right gain register 1
(BTL gain register)
0011 1111
6: Mute
(BTL
ga
i
n reg
i
s
t
er
)
0011
1111
7: Mute
0–5: Gain level
Left gain register 1
(BTL gain register)
0011 1111
6: Mute
(BTL
ga
i
n reg
i
ster
)
00
7: Mute
0–5: Gain level
Right gain register 2
(SE gain register)
0011 1111
6: Mute
(SE
ga
i
n reg
i
ster
)
00
7: Mute
0–5: Gain level
Left gain register 2
(SE gain register)
0011 1111
6: Mute
(SE
ga
i
n reg
i
ster
)
00
7: Mute
0: Disable internal SHUTDOWN control
1: Disable internal SE/BTL control
Mask register 1111 1111
2: Disable internal PCB enable control
Mask
register
1111
1111
3–6: Unused
7: Powering up indicator (read only)
0: SHUTDOWN
1: HP/LINE
2: Reserved
Control register
0000 0000
3: Mute
Control register 0000 0000
4: Reserved
5: SE/BTL
6: Gain register select
7:PCBEEP
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Texas Instruments TPA0172EVM - (Rev. A) User guide
- Category
- Car audio amplifiers
- Type
- User guide
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